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Three files legal challenge to Ofcom's mobile spectrum auction rules

But Vodafone hits out at Three claiming it will 'unnecessarily delay' the auction

Three has filed its long-threatened legal challenge to telecoms regulator Ofcom over the rules it has established to govern the forthcoming auction of mobile spectrum.

Three this week formally filed its legal challenge, which threatens Ofcom over its "meaningless" 37 per cent spectrum cap.

Ofcom announced the cap back in July, which means that BT and Vodafone, which currently own 45 per cent and 28 per cent of the spectrum currently available, will be restricted in how much of the critical 5G spectrum they can buy up later this year.

At the time, Three - which had called for a 30 per cent cap - described the decision it as a "kick in the teeth for all consumers" and claimed that Ofcom is "damaging competition, restricting choice and pushing prices up for the very consumers that it is meant to protect."

The firm argues that Ofcom's promised plans "fail completely to achieve… the decision's own basic objective of avoiding very asymmetric spectrum shares," adding that the proposed auction rules mean that BT could have a share of more than 39 per cent until 2020.

"We confirm that we have filed a judicial review before the UK courts in relation to the competition measures that will apply in the upcoming spectrum auction," a Three spokesperson said.

"It is absolutely vital that the regulator gets this auction right for the long-term benefit of all consumers."

However, Three's larger rival Vodafone has slammed Three's legal challenge, claiming that it will "unnecessarily delay" the process.

In a statement to the Financial Times, a spokesperson added: "This is not in the interest of consumers and will undermine the UK's efforts to be a leading digital economy."

Ofcom, meanwhile, described the challenge as "very regrettable", and confirmed Vodafone's claim that it would delay the auction.

It continued: "The auction will now be delayed by this litigation, which will harm consumers, businesses and ultimately the UK economy. It is now crucial that companies don't drag their feet, so the case can be heard as soon as possible."